Senior Backend Developer (Java / Spring Boot)

About the Project

You'll join our client's team working on a live, production B2B SaaS platform in the sales/revenue operations space — including pipeline management, sales process configuration, risk alerting, and role-based analytics.

The client's product is fully launched and actively used in production. It runs on AWS, uses enterprise SSO (OAuth2/OIDC), and integrates with an external data platform.

This is not a greenfield project — you'll be working with an established codebase and existing engineering practices, including automated testing, pre-commit hooks, and CI enforcement. Your focus will be on extending backend functionality, improving architecture, and further strengthening the platform.

Responsibilities

Build, maintain, and extend backend functionality using Java and Spring Boot

Design and develop REST APIs and backend integrations

Work within and help enforce a hexagonal / DDD-oriented architecture, keeping domain logic decoupled from framework and persistence concerns

Raise automated test coverage across domain and application layers and maintain a strong testing culture

Help introduce architecture-conformance checks, such as ArchUnit, to enforce dependency boundaries

Contribute to migrating backend dependencies from early-access or milestone releases to stable GA versions as part of ongoing platform hardening

Maintain and extend OAuth2/OIDC-based authentication and role-based access control

Work with PostgreSQL, database schema evolution, and Flyway migrations

Maintain integrations with external data platforms, including Databricks

Strengthen secrets and credentials management across the codebase and CI/CD

Participate in code reviews, technical design discussions, troubleshooting, and production incident response

Requirements

5+ years of professional backend development experience

Strong production experience with Java and Spring Boot

Strong understanding of REST API design and backend architecture

Hands-on experience with Spring Security and OAuth2/OIDC flows

Strong PostgreSQL experience and knowledge of schema migration tooling such as Flyway

Experience with AWS

Strong testing discipline with JUnit 5 and Testcontainers

Experience with Docker and container-based deployment, ideally AWS ECS/Fargate or equivalent

Comfortable working with or refactoring toward hexagonal, clean, or DDD-oriented architecture

Understanding of CI/CD and production engineering practices

English — Upper-Intermediate or higher

Nice to Have

Experience with AWS Secrets Manager and cloud secrets management

Experience integrating with data platforms such as Databricks

Experience with ArchUnit or similar architecture-enforcement tooling

Experience modernizing or hardening mature production codebases

Experience migrating framework or library dependencies from early-access versions to stable GA releases

Experience with monitoring and observability tools such as Datadog